1. Department of Orthopedic Trauma, Hand, Plastic and Reconstructive Surgery, University Hospital of Ulm, 89081 Ulm, Germany
2. Institute of Pathophysiology and Process Development in Anesthesia, University of Ulm, 89081 Ulm, Germany
3. Department of Anesthesiology, University Hospital of Ulm, 89081 Ulm, Germany
4. Department of Orthopedic Surgery, University of Ulm, RKU, 89081 Ulm, Germany